EchoMark

Overview

EchoMark embeds invisible, recipient-specific steganographic watermarks in emails, documents, images and attachments to trace leaks, supports Exchange/Google Workspace and SecureView links, provides forensic matching, access controls, analytics, revoke options, and APIs for DLP integration.

From the official site

EchoMark embeds invisible forensic watermarks into sensitive emails, documents, images, and screens so information leaks can be traced back to the source.

The text above is quoted from this tool’s official website — the vendor’s own words.

How to use it

1. Register at echomark.com and create your first work item
2. Import the material you want to process
3. State the output requirements and format, adding background as needed
4. Review the result and export, iterating once more if necessary